{"id":3621,"date":"2015-08-18T08:17:49","date_gmt":"2015-08-18T06:17:49","guid":{"rendered":"https:\/\/usersnap.com\/?p=3621"},"modified":"2025-08-06T14:15:34","modified_gmt":"2025-08-06T12:15:34","slug":"firefox-add-ons-for-developers-designers","status":"publish","type":"post","link":"https:\/\/usersnap.com\/blog\/firefox-add-ons-for-developers-designers\/","title":{"rendered":"12 Greatest Firefox Add-ons For Developers &#038; Designers"},"content":{"rendered":"\n<p>With the latest Firefox browser update &#8211; Firefox Quantum &#8211; Mozilla made a leap forward in the browser game. The new Firefox browser is not only super-speedy and sleek. It caused an uproar as the new version only supports Firefox add-ons using the WebExtensions API.<\/p>\n\n\n\n<p>We researched, reviewed, and hand-picked 12 of the best Firefox add-ons for developers.<br><\/p>\n\n\n\n<!--more-->\n\n\n\n<h2 class=\"wp-block-heading\">The Best Firefox Add-ons for Firefox Quantum<\/h2>\n\n\n\n<div class=\"\" data-block=\"true\" data-editor=\"3k6h0\" data-offset-key=\"98sgv-0-0\">\n<div class=\"public-DraftStyleDefault-block public-DraftStyleDefault-ltr\" data-offset-key=\"98sgv-0-0\"><span data-offset-key=\"98sgv-1-0\">Mozilla got quite some attention after launching Firefox Quantum in November 2017. <\/span><span class=\"adverb\"><span data-offset-key=\"boas-0-0\">Mostly<\/span><\/span><span data-offset-key=\"boas-1-0\"> due to its <\/span><span class=\"adverb\"><span data-offset-key=\"boas-2-0\">surprisingly<\/span><\/span><span data-offset-key=\"boas-3-0\"> great performance.<\/span><\/div>\n<\/div>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>It&#8217;s fast. Really fast. Firefox Quantum is over twice as fast as Firefox from 6 months ago.<\/p>\n<\/blockquote>\n\n\n\n<p>(source: <a href=\"https:\/\/blog.mozilla.org\/blog\/2017\/11\/14\/introducing-firefox-quantum\/\">Mozilla<\/a>)<\/p>\n\n\n\n<p>Apart from the performance improvements, Mozilla updated these features as well:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Minimalistic design<\/li>\n\n\n\n<li>Private browsing &amp; tracking protection<\/li>\n\n\n\n<li>WebExtensions support<\/li>\n<\/ul>\n\n\n\n<div class=\"\" data-block=\"true\" data-editor=\"3k6h0\" data-offset-key=\"98sgv-0-0\">\n<div class=\"public-DraftStyleDefault-block public-DraftStyleDefault-ltr\" data-offset-key=\"98sgv-0-0\"><span data-offset-key=\"98sgv-0-0\">On a downside, Firefox might no longer support your favorite add-ons. With the new update, legacy add-ons that do not use the WebExtensions API are not available.<\/span><\/div>\n<div data-offset-key=\"98sgv-0-0\">&nbsp;<\/div>\n<div class=\"public-DraftStyleDefault-block public-DraftStyleDefault-ltr\" data-offset-key=\"98sgv-0-0\"><span class=\"hardreadability\"><span data-offset-key=\"asfsm-0-0\">The good news is: We reviewed and collected the best Firefox add-ons for developers (supported by Firefox Quantum)<\/span><\/span><span data-offset-key=\"asfsm-1-0\">.<\/span><\/div>\n<\/div>\n\n\n\n<h2 class=\"wp-block-heading\">1. Usersnap<\/h2>\n\n\n\n<p>The <strong><a href=\"https:\/\/usersnap.com\/slack?utm_source=blog&amp;utm_medium=blog&amp;utm_campaign=firefox_blogpost\">Usersnap Firefox add-on<\/a><\/strong> lets you capture and annotate any website. It works great for collecting and managing <a href=\"https:\/\/usersnap.com\/templates\">user feedback<\/a> on websites or applications or for tracking bugs in your browser.<\/p>\n\n\n\n<p>All screenshots are directly saved in your Usersnap projects. It integrates with your workflow, and you can connect Usersnap with <a href=\"https:\/\/usersnap.com\/jira?utm_source=blog&amp;utm_medium=blog&amp;utm_campaign=firefox_blogpost\">JIRA<\/a>, <a href=\"https:\/\/usersnap.com\/trello?utm_source=blog&amp;utm_medium=blog&amp;utm_campaign=firefox_blogpost\">Trello<\/a>, <a href=\"https:\/\/usersnap.com\/slack?utm_source=blog&amp;utm_medium=blog&amp;utm_campaign=firefox_blogpost\">Slack<\/a> and 20 other project management tools. A perfect fit for QA and development teams.<\/p>\n\n\n<div class=\"acf-cta\" style=\"background-image: url(https:\/\/usersnap.com\/blog\/wp-content\/uploads\/2025\/02\/Group-1000004194.svg); width: 100%;\"><h2>Try Usersnap for Customizing Your Feedback Widget<\/h2><a href=\"https:\/\/usersnap.com\/signup\" class=\"cta-button\">Try Usersnap Now<\/a><\/div>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img decoding=\"async\" width=\"558\" height=\"307\" src=\"https:\/\/usersnap.com\/blog\/wp-content\/uploads\/2017\/03\/point-click-reporting3-hc7d1a4769f53e3282d3348ebf8cad732f.gif\" alt=\"Usersnap's Browser Extension in actions \" class=\"wp-image-7860\" title=\"Browser Extension Usersnap\"\/><\/figure>\n<\/div>\n\n\n<p>Try Usersnap for free:&nbsp;<a href=\"https:\/\/addons.mozilla.org\/en-us\/firefox\/addon\/usersnap\/\" target=\"_blank\" rel=\"noopener noreferrer\">https:\/\/addons.mozilla.org\/en-us\/firefox\/addon\/usersnap\/<\/a><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">2. Web Developer<\/h2>\n\n\n\n<p><span class=\"hardreadability\"><span data-offset-key=\"98sgv-0-0\">I absolutely recommend the &#8216;<em>Web Developer<\/em>&#8216; add-on. It gives you some great features which will make your development workflow faster<\/span><\/span><span data-offset-key=\"98sgv-1-0\">.<\/span><\/p>\n\n\n\n<p>I enjoy various CSS, form and image options. No matter if I want to check alt tags, missing images or image dimensions, this add-on is my preferred choice.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img decoding=\"async\" width=\"600\" height=\"434\" src=\"https:\/\/usersnap.com\/blog\/wp-content\/uploads\/2015\/08\/firefox-web-developer-addon.png\" alt=\"web developer among the best firefox add-ons\" class=\"wp-image-8004\" title=\"The Web Developer Firefox add-on in action\"\/><\/figure>\n<\/div>\n\n\n<figure class=\"wp-block-embed\"><div class=\"wp-block-embed__wrapper\">\nhttps:\/\/addons.mozilla.org\/en-us\/firefox\/addon\/web-developer\n<\/div><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">3. User Agent Switcher<\/h2>\n\n\n\n<p>The User Agent Switcher allows you to switch the user agent of&nbsp;your browser. The add-on will add an option&nbsp;to the tool settings. This option lets you switch the user agent.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img decoding=\"async\" width=\"600\" height=\"446\" src=\"https:\/\/usersnap.com\/blog\/wp-content\/uploads\/2015\/08\/user-agent-switcher-firefox.png\" alt=\"screenshot of user agent switcher firefox add-on\" class=\"wp-image-8006\" title=\"user agent switcher among best firefox add-ons\"\/><\/figure>\n<\/div>\n\n\n<figure class=\"wp-block-embed\"><div class=\"wp-block-embed__wrapper\">\nhttps:\/\/addons.mozilla.org\/en-US\/firefox\/addon\/uaswitcher\n<\/div><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">4. Ghostery<\/h2>\n\n\n\n<div class=\"\" data-block=\"true\" data-editor=\"3k6h0\" data-offset-key=\"98sgv-0-0\">\n<div class=\"public-DraftStyleDefault-block public-DraftStyleDefault-ltr\" data-offset-key=\"98sgv-0-0\"><span data-offset-key=\"98sgv-0-0\">Ghostery is a great add-on to display installed trackers and pixels of any website. It helps you to find and analyze the used marketing- and tech stack of any website. And you can block them if you don&#8217;t want your session to be recorded.<\/span><\/div>\n<\/div>\n\n\n\n<div class=\"\" data-block=\"true\" data-editor=\"3k6h0\" data-offset-key=\"4iv7u-0-0\">&nbsp;<\/div>\n\n\n\n<div class=\"\" data-block=\"true\" data-editor=\"3k6h0\" data-offset-key=\"4btc7-0-0\">&nbsp;<\/div>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img decoding=\"async\" width=\"600\" height=\"391\" src=\"https:\/\/usersnap.com\/blog\/wp-content\/uploads\/2015\/08\/ghostery-firefox-addon.png\" alt=\"Screenshot of Ghostery Firefox Addon\" class=\"wp-image-8010\" title=\"Ghostery Firefox Add-on\"\/><\/figure>\n<\/div>\n\n\n<figure class=\"wp-block-embed\"><div class=\"wp-block-embed__wrapper\">\nhttps:\/\/addons.mozilla.org\/en-us\/firefox\/addon\/ghostery\n<\/div><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">5. ColorZilla<\/h2>\n\n\n\n<p>ColorZilla is an advanced color picker and eyedropper. It allows you to get the color of any pixel in the browser window. The extension also has a built-in averaging square. This helps you get a matching color to for a photo.&nbsp;The add-on is pretty simple and easy to use.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img decoding=\"async\" width=\"600\" height=\"326\" src=\"https:\/\/usersnap.com\/blog\/wp-content\/uploads\/2015\/08\/colorzilla-firefox.png\" alt=\"Screenshot of colorzilla firefox add-on\" class=\"wp-image-8016\" title=\"colorzilla firefox add-on for developers\"\/><\/figure>\n<\/div>\n\n\n<figure class=\"wp-block-embed\"><div class=\"wp-block-embed__wrapper\">\nhttps:\/\/addons.mozilla.org\/en-uS\/firefox\/addon\/colorzilla\n<\/div><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">6. HTTPS Everywhere<\/h2>\n\n\n\n<div class=\"\" data-block=\"true\" data-editor=\"3k6h0\" data-offset-key=\"98sgv-0-0\">\n<div class=\"public-DraftStyleDefault-block public-DraftStyleDefault-ltr\" data-offset-key=\"98sgv-0-0\"><span data-offset-key=\"98sgv-0-0\">This Firefox add-on encrypts all your communication with many major websites.&nbsp;<\/span><\/div>\n<div data-offset-key=\"98sgv-0-0\">&nbsp;<\/div>\n<div class=\"public-DraftStyleDefault-block public-DraftStyleDefault-ltr\" data-offset-key=\"98sgv-0-0\">As many sites support HTTPS, they still might use HTTP. Or they fill encrypted pages with links that go back to unencrypted sites. The HTTPS Everywhere add-on fixes these problems by rewriting all requests to HTTPS.<\/div>\n<\/div>\n\n\n\n<p><a href=\"https:\/\/addons.mozilla.org\/en-US\/firefox\/addon\/https-everywhere\/\">https:\/\/addons.mozilla.org\/en-US\/firefox\/addon\/https-everywhere\/<\/a><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">7. BuiltWith<\/h2>\n\n\n\n<div class=\"\" data-block=\"true\" data-editor=\"3k6h0\" data-offset-key=\"98sgv-0-0\">\n<div class=\"public-DraftStyleDefault-block public-DraftStyleDefault-ltr\" data-offset-key=\"98sgv-0-0\"><span data-offset-key=\"98sgv-0-0\">The BuiltWith add-on analyses websites and their technologies, servers, and hosts.&nbsp;<\/span>It works great for analyzing competitor websites and you can get insights on any web page.<\/div>\n<div data-offset-key=\"98sgv-0-0\">&nbsp;<\/div>\n<\/div>\n\n\n\n<div class=\"\" data-block=\"true\" data-editor=\"3k6h0\" data-offset-key=\"bfqu1-0-0\">\n<div class=\"public-DraftStyleDefault-block public-DraftStyleDefault-ltr\" data-offset-key=\"bfqu1-0-0\"><span data-offset-key=\"bfqu1-0-0\">And it even displays tracking IDs, like the Google Analytics ID.<\/span><\/div>\n<\/div>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img decoding=\"async\" width=\"600\" height=\"376\" src=\"https:\/\/usersnap.com\/blog\/wp-content\/uploads\/2015\/08\/built-with-firefox-addon-1.png\" alt=\"screenshot of builtwith firefox add-on\" class=\"wp-image-8012\" title=\" builtwith firefox add-on\"\/><\/figure>\n<\/div>\n\n\n<figure class=\"wp-block-embed\"><div class=\"wp-block-embed__wrapper\">\nhttps:\/\/addons.mozilla.org\/en-US\/firefox\/addon\/builtwith\n<\/div><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">8. Web Developer Checklist<\/h2>\n\n\n\n<div class=\"\" data-block=\"true\" data-editor=\"3k6h0\" data-offset-key=\"98sgv-0-0\">\n<div class=\"public-DraftStyleDefault-block public-DraftStyleDefault-ltr\" data-offset-key=\"98sgv-0-0\"><span data-offset-key=\"98sgv-1-0\">The Web Developer Checklist is a simple add-on that gives you an overview of the usability of your site.&nbsp;<\/span><\/div>\n<\/div>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img decoding=\"async\" width=\"600\" height=\"340\" src=\"https:\/\/usersnap.com\/blog\/wp-content\/uploads\/2015\/08\/web-developer-checklist-firefox.png\" alt=\"Screenshot of web developer checklist firefox addon\" class=\"wp-image-8017\" title=\"web developer checklist firefox addon\"\/><\/figure>\n<\/div>\n\n\n<figure class=\"wp-block-embed\"><div class=\"wp-block-embed__wrapper\">\nhttps:\/\/addons.mozilla.org\/de\/firefox\/addon\/webdeveloperchecklist\n<\/div><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">9. Cookie Manager<\/h2>\n\n\n\n<div class=\"\" data-block=\"true\" data-editor=\"3k6h0\" data-offset-key=\"98sgv-0-0\">\n<div class=\"public-DraftStyleDefault-block public-DraftStyleDefault-ltr\" data-offset-key=\"98sgv-0-0\"><span data-offset-key=\"98sgv-0-0\">This Cookie Manager lets you check and manage the cookies. You are able to view, add, change or even delete cookies in any of the domains.&nbsp;<\/span><\/div>\n<div data-offset-key=\"98sgv-0-0\">&nbsp;<\/div>\n<div class=\"public-DraftStyleDefault-block public-DraftStyleDefault-ltr\" data-offset-key=\"98sgv-0-0\">You can even export and import cookies.&nbsp;This is helpful to reproduce certain issues by recreating certain browser sessions.<\/div>\n<\/div>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img decoding=\"async\" width=\"600\" height=\"388\" src=\"https:\/\/usersnap.com\/blog\/wp-content\/uploads\/2015\/08\/cookie-manager-firefox-addon.png\" alt=\"screenshot of cookie manager firefox addon\" class=\"wp-image-8018\" title=\"cookie manager firefox addon\"\/><\/figure>\n<\/div>\n\n\n<figure class=\"wp-block-embed\"><div class=\"wp-block-embed__wrapper\">\nhttps:\/\/addons.mozilla.org\/de\/firefox\/addon\/a-cookie-manager\n<\/div><\/figure>\n\n\n<div class=\"acf-cta\" style=\"background-image: url(https:\/\/usersnap.com\/blog\/wp-content\/uploads\/2025\/02\/Group-1000004194.svg); width: 100%;\"><h2>Try Usersnap for Customizing Your Feedback Widget<\/h2><a href=\"https:\/\/usersnap.com\/signup\" class=\"cta-button\">Try Usersnap Now<\/a><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">10. NoScript Security Suite<\/h2>\n\n\n\n<div class=\"\" data-block=\"true\" data-editor=\"3k6h0\" data-offset-key=\"9beoe-0-0\">\n<div class=\"public-DraftStyleDefault-block public-DraftStyleDefault-ltr\" data-offset-key=\"9beoe-0-0\">\n<div class=\"\" data-block=\"true\" data-editor=\"3k6h0\" data-offset-key=\"98sgv-0-0\">\n<div class=\"public-DraftStyleDefault-block public-DraftStyleDefault-ltr\" data-offset-key=\"98sgv-0-0\"><span data-offset-key=\"98sgv-0-0\">Winning the &#8220;PC World Class Award&#8221;, this Firefox add-on got quite some attention. It is one of the top-rated add-ons.&nbsp;<\/span>This extension makes your browser safer by restricting JavaScript and other executable content.<\/div>\n<\/div>\n<\/div>\n<\/div>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img decoding=\"async\" width=\"600\" height=\"227\" src=\"https:\/\/usersnap.com\/blog\/wp-content\/uploads\/2015\/08\/noscript-firefox-addon.png\" alt=\"screenshot of noscript firefox addon\" class=\"wp-image-8025\" title=\"noscript firefox addon\"\/><\/figure>\n<\/div>\n\n\n<figure class=\"wp-block-embed\"><div class=\"wp-block-embed__wrapper\">\nhttps:\/\/addons.mozilla.org\/EN-uS\/firefox\/addon\/noscript\n<\/div><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">11. Open Lorem<\/h2>\n\n\n\n<p><span data-offset-key=\"98sgv-0-0\">As a web developer or designer, you\u2019ll find this extension quite helpful. Open Lorem generates <\/span><span data-offset-key=\"98sgv-0-1\">\u201clorem ipsum<\/span><span data-offset-key=\"98sgv-0-2\">\u201d text for you and your websites.<\/span><\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img decoding=\"async\" width=\"600\" height=\"482\" src=\"https:\/\/usersnap.com\/blog\/wp-content\/uploads\/2015\/08\/open-lorem-firefox-addon.png\" alt=\"screenshot of open lorem firefox addon\" class=\"wp-image-8033\" title=\"open lorem firefox addon\"\/><\/figure>\n<\/div>\n\n\n<figure class=\"wp-block-embed\"><div class=\"wp-block-embed__wrapper\">\nhttps:\/\/addons.mozilla.org\/de\/firefox\/addon\/openlorem\n<\/div><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">12. Page Performance Test<\/h2>\n\n\n\n<div class=\"\" data-block=\"true\" data-editor=\"3k6h0\" data-offset-key=\"98sgv-0-0\">\n<div class=\"public-DraftStyleDefault-block public-DraftStyleDefault-ltr\" data-offset-key=\"98sgv-0-0\"><span data-offset-key=\"98sgv-0-0\">It analyses web pages&#8217; performance based on various parameters. The Page Performance Test measures network, browser, and server performance.<\/span><\/div>\n<\/div>\n\n\n\n<div class=\"\" data-block=\"true\" data-editor=\"3k6h0\" data-offset-key=\"34v5d-0-0\">\n<div class=\"public-DraftStyleDefault-block public-DraftStyleDefault-ltr\" data-offset-key=\"34v5d-0-0\"><span data-offset-key=\"34v5d-0-0\">&nbsp;<\/span><\/div>\n<\/div>\n\n\n\n<div class=\"\" data-block=\"true\" data-editor=\"3k6h0\" data-offset-key=\"6p4s7-0-0\">\n<div class=\"public-DraftStyleDefault-block public-DraftStyleDefault-ltr\" data-offset-key=\"6p4s7-0-0\"><span class=\"hardreadability\"><span data-offset-key=\"6p4s7-0-0\">You can use Page Performance Test directly on your console:<\/span><\/span><\/div>\n<\/div>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Open up your console; you will now find a new tab &#8220;page performance&#8221;<\/li>\n\n\n\n<li>Start the performance test<\/li>\n<\/ol>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img decoding=\"async\" width=\"600\" height=\"412\" src=\"https:\/\/usersnap.com\/blog\/wp-content\/uploads\/2015\/08\/page-performance-test.png\" alt=\"screenshot of page speed performance test\" class=\"wp-image-8027\" title=\"page speed performance test\"\/><\/figure>\n<\/div>\n\n\n<figure class=\"wp-block-embed\"><div class=\"wp-block-embed__wrapper\">\nhttps:\/\/addons.mozilla.org\/en-US\/firefox\/addon\/page-performance-test\/?src=api\n<\/div><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Summary<\/h2>\n\n\n\n<p>In this article, we collected the best Firefox add-ons for developers and designers. <strong>Firefox Quantum <\/strong>and&nbsp;the listed Firefox add-ons allow you to step up your development workflow. Go, and check out these add-ons and see how they can make your Firefox a more powerful browser.<\/p>\n\n\n\n<p><em>This article was brought to you by <a href=\"https:\/\/usersnap.com\/?utm_source=blog&amp;utm_medium=blog&amp;utm_campaign=firefox_blogpost\" target=\"_blank\" rel=\"noopener noreferrer\">Usersnap<\/a> &#8211; a visual bug tracking tool for every web project. Used by software companies, like <a href=\"https:\/\/usersnap.com\/success-stories?utm_source=blog&amp;utm_medium=blog&amp;utm_campaign=firefox_blogpost\">Facebook<\/a>, <a href=\"https:\/\/usersnap.com\/success-stories?utm_source=blog&amp;utm_medium=blog&amp;utm_campaign=firefox_blogpost\">AddThis<\/a>, and <a href=\"https:\/\/usersnap.com\/success-stories?utm_source=blog&amp;utm_medium=blog&amp;utm_campaign=firefox_blogpost\">Google<\/a>.<\/em> <em>We have 100% faith that user feedback will help companies strive, therefore we allow you to try out Usersnap for free, for real &#8211; no credit card, no time limit, no gated features. Once you have experienced the power of collecting and acting on user feedback, we then prompt you to select a paid plan.<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"<p>With the latest Firefox browser update &#8211; Firefox Quantum &#8211; Mozilla made a leap forward in the browser game. The new Firefox browser is not only super-speedy and sleek. It caused an uproar as the new version only supports Firefox add-ons using the WebExtensions API. We researched, reviewed, and hand-picked 12 of the best Firefox [&hellip;]<\/p>\n","protected":false},"author":16,"featured_media":8359,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":true,"inline_featured_image":false,"ub_ctt_via":"","footnotes":""},"categories":[8],"tags":[],"class_list":["post-3621","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-web-development-blog"],"acf":[],"featured_image_src":"https:\/\/usersnap.com\/blog\/wp-content\/uploads\/2015\/08\/firefox-addons-developers-4.png","author_info":{"display_name":"Thomas Peham","author_link":"https:\/\/usersnap.com\/blog\/author\/thomas\/"},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.6 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>12 Firefox Add-ons for Developers &amp; Designers - Usersnap<\/title>\n<meta name=\"description\" content=\"We reviewed 12 of the best Firefox Add-ons. Web Developer - Ghostery - ColorZilla - Usersnap - Page Performance Test &amp; more.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/usersnap.com\/blog\/firefox-add-ons-for-developers-designers\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"12 Firefox Add-ons for Developers &amp; Designers - Usersnap\" \/>\n<meta property=\"og:description\" content=\"We reviewed 12 of the best Firefox Add-ons. 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